Door-check.



H. T. SMITH.

DOOR CHECK.

APPLICATION FILED MAR. 21. ms.

1.220369. Patented Mar. 27, 1917.

ZWJWM' f s m. PHOTO-LUNG" WASMINGYON, n. c.

ENE STATE PATEIQT @FFTQE.

HORACE '1. SMITH, OF CAMBRIDGE, MASSACHUSETTS.

DOOR-CHECK.

tended that oil shall be contained in theactuator compartment, and thatthe other compartment shall be dry. The shaft hearing the pinion orother actuator, which is hereafter'referred to as the pinion-shaft,extends through the dry compartment and has associated with .it apacking-gland, which packing-gland is tightly associated with adiaphragm which separates the two compartments, and by this means it isintended that the oil shall be prevented from entering the drycompartment.

In practice, however, some oil leaks by the packing-means usuallyprovided, and enters the dry compartment whereupon the door checkneedsto be repaired.

This invention has for its object to improve the construction of thistype of door check to the end that the oil contained in the oilcompartment shall be effectively prevented from entering the drycompartment.

Figure 1 is a front elevation of the door check of the rack and piniontype, and commonly known on the market as the Norton door check, havingmy improvements.

Fig. 2 is an enlarged elevation and partial section of the pinion, itsshaft and liquid tight packing-means associated therewith, embodying myinvention.

1 represents the case of the door check; 2 the diaphragm dividing thecase into two compartments 3 and 4:. The compartment 3 is adapted tocontain oil, and the compartment 4-is intended to be dry. The pinion 5,and rack 6, and associated parts are contained in the oil compartment 3,except that the shaft 7 bearing the pinion 5, or other actuator, isextended up through the diaphragm 2 and the dry compartment 4:, and

Specification of Letters Patent.

Application filed March 21, 1916.

Patented Mar. 27, 1917.

Serial No. 85,705.

has its top bearing in the top of said dry compartment.

The packinggland 10 is arranged on the shaft 7, it having ascrew-threaded portion 11, which engages a threaded hole through thediaphragm 2; and also having a flange 12, at the top, adapted to receivea wrench by which it may be turned, said flange being arranged above thediaphragm 2 and adapted to be brought into engagement with thediaphragm, so that a liquid tight oint is produced at such place. Saidpacking-gland has an internal recess 13, which contains a packing 14,surrounding the shaft 7, and a ring 15 is normally pressed down on saidpacking by a spring 16. This packing cannot be pressed down sufficientlytight to prevent leakage at such point without binding so tightly as toprevent free rotation of the shaft, hence the novel means embodying thisinvention are employed to accomplish this result.

Herein the pinion 5, or it may be any other actuator on the shaft 7, hasan annular extension 20, at its upper end, and said extension is formedwith a conical seat, and the lower end of the packing-gland is extended,as at 22, and said extended endportion is made to correspond to theconical seats, their engaging faces being ground to fit each othercoextensively with their areas. By means of the conical end-portion onthe packing-gland, and the conical-seat at the upper end of the pinionor other actuator, a liquid tight joint will be formed at such point,and the shaft may be freely turned, notwithstanding their tightengagement, and an additional bearing or support is provided for theshaft intermediate its length.

I claim The door check herein described having an oil compartment and adry compartment separated by a diaphragm, actuating-means arranged inthe oil compartment, a shaft bear ing one of the elements of theactuatingmeans, which is extended through the diaphragm and the drycompartment and having end-bearings, and an additional bearing andsupport for said shaft intermediate its length, comprising a glandstationarily supported by the diaphragm, which gland surrounds the shaftand has a conical end, and an extension with conical recess formed inconical end of said gland, by which said the component of theactuating-means which In testimony whereof, I have signed my is borne bythe shaft adapted to engage the name to this specification, in thepresence of twosubscrlblng Witnesses.

component and the shaft hearing it will be HORACE T, SMITH.

held against lateral deflection, and a joint Witnesses: will be formedWhich will be liquid tight B. J. NOYES, even in case the shaft shouldgyrate slightly. H. B. DAVIS;

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, :WashingtomD. 0;

